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INVESTMENTS - Tongcheng-Elong and MakeMyTrip (Details) - CNY (¥) ¥ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Aug. 31, 2019 | Dec. 31, 2018
INVESTMENTS |  |  |  |  |
Carrying value under equity investments |  | ¥ 32,049 | ¥ 28,494 |  |
MakeMyTrip |  |  |  |  |
INVESTMENTS |  |  |  |  |
Carrying value under equity investments |  | 5,900 | 5,600 |  |
MakeMyTrip | Covid19 |  |  |  |  |
INVESTMENTS |  |  |  |  |
Equity Method Investment Impairment Charges | ¥ 700 |  |  |  |
Publicly traded |  |  |  |  |
INVESTMENTS |  |  |  |  |
Increased equity investments value |  | 14,500 |  |  |
Equity investments, market value |  | 22,500 |  |  |
Tongcheng-eLong |  |  |  |  |
INVESTMENTS |  |  |  |  |
Equity method investment, ownership interest (as a percent) |  |  |  |  | 27.00%
Carrying value under equity investments |  | ¥ 5,900 | ¥ 5,700 |  |
MakeMyTrip |  |  |  |  |
INVESTMENTS |  |  |  |  |
Equity method investment, ownership interest (as a percent) |  |  |  | 49.00% |

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